Disk-supporting attachment for grindstones.



no. s64,|49.

' Patented nec. la, |900. w. w. HEwITT. DISK SUPPORTING ATTACHMENT FOR GRINDSTNES.

(Application led Sept. 10, 1900.)

(No Model.)

W/ TNE SSE S UNiTnn STATES PATENT Ori-rien.

WILLIAM WALLACE HEWITT, OF GETTYSBURG, SOUTH DAKOTA.

. DISK-SUPPORTING ATTAQHMENT FOR GRINDSTONES.

SPECIFICATION forming part of Letters Patent No. 664,149, dated December 18, 1900. Application filed September l0, 1900. Serial No. 29,520. (No model.)

'tion for rotation and for engagement with an emery or other grinding Wheel and to so support the disk or colter thus held that it WillY run true and so that While a perfect support is obtained the supports will in no manner interfere with the process of sharpening. I

The invention consistsv in the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claims.

Reference is to be had to the accompanyingdrawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in both figures.

Figure 1 is a perspective View of the irnproved device; and Fig. 2 is an edge view of the device, showing a disk in position thereon, the disk being partly broken away.

A represents a base, Which may be of any desired material and of any approved shape. A post 10 rises from the base, and this post is given more or less of an inclination in direction of the left side ofthe base When in position in front of the-Wheel. The post 10 carries a plunger 11, Which is loosely mounted thereon and has a polygonal lower section 11a, adapted to enter a central openiugin the disk, and above this plunger and adapted for engagement with the same a Washer 12 is loosely mounted on the post. A second Washer 13 is loosely mounted at the top portion of the post, and above this second Washer a nut 14D is screwed on the upper end of the post, Which is properly threaded. A spring 15 is coiled around the post l0, between the Washers 12 and 13, and when the plunger 11 is raised the spring 15 is placed under tension. In front of the post 10, at or near the corner portions of the base, bearings 16 are secured to said base, the right-hand bearing being about twice the height of the other bearing, thus tilting the disk to theleft, and these bearings are at angles to each other or are placed diagonally on the base or at angles to a line drawn transversely between the post and the bearings. The inclination of the bearings 16 is in direction of the post 10, and in each bearing 16 a Wheel 17 is mounted to freely turn, one Wheel being larger than the other, and these Wheels are adapted to have bearing against the convexed surface of the disk B which is to be sharpened, and which disk is held to turn on the post 10. The post 10 is given the inclination described in order that the bearings 16 need not be unduly inclined to bring the full width of the periphery into engagement lwith the convexed surface of the disk.

The disk B is so placed on the post 10 that its concaved surface is uppermost, and before the disk is placed on the post 10 the plunger, Washers, spring, and nut are removed from the post. After the disk has found a seat on the Wheels or friction-rollers 17 the plunger is placed on the post and permitted to drop through the disk to an engagement with the central concaved surface of the disk, whereupon the Washer l2 and spring 15 are placed in position and next the upper Washer 13. Finally the nut 14 is screwed upon the upper end of the post until the spring has sufficient bearing on the plunger 11 to hold the disk steady, so that when the device is carried to a grindstone and the grinding-Wheel is brought into sharpening contact With the disk said disk will revolve by contact With the grindstone during the sharpening process. The disk is mounted to revolve and is supported in its revolving position in order that the said disk s hall not be liable to become heated and the temper drawn therefrom While it is being sharpened.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. Adisk-supporting attachment for grindstones, comprising a post adapted to receive the disk to be sharpened, and rollers on a support, the post being inclined with respect to the rollers.

2. A disk-supporting attachment for grindstones, comprising a post adapted to receive IOO the disk to be sharpened, and rollers on a support, the rollers being inclined toward the post.

3. A disk-supporting attachment for grindstones, comprising a post adapted to receive the disk to be sharpened, rollers of different diameters on a support, and means for retaining the disk against the rollers.

4. A disk-supporting attachment for grindstones, comprising a post adapted to receive the disk to be sharpened, inwardly-inclined rollers of different diameters on a support, and means for retaining the disk against the rollers.

5. In a disk supporting attachment for grindstones, a hase, a post in connection with the base, and friction-Wheels carried by the base, having bearing against the disk, as set forth.

6. In a disk-supporting device for grindstones, a base, a post carried by the base, a spring-controlled plunger located on the post and adapted for engagement With the concaved or upper surface of the disk and for binding engagement with the central portion of the disk, and friction-wheels carried by the base, arranged for bearing against the conveXed or under surface of the disk, as Set forth.

7. In a disk supporting attachment for grindstones, a base, a post carried by the base, a spring-controlled plunger loosely mounted upon the post and having a portion adapted for engagement With the concaved or upper side of the disk, and a polygonal portion adapted to enter a central openingin the disk, and friction Wheels of varying diameter mounted on the base and inclined toward the post, the post having an inclination in direction of one side of the base, as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM WALLACE HEWITT.

Witnesses:

A. G. WILLIAMS, V. ARBoUR. 

